-9=4x-7x

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Solution for -9=4x-7x equation: 



-9=4x-7x

We move all terms to the left:

-9-(4x-7x)=0

We add all the numbers together, and all the variables

-(-3x)-9=0

We get rid of parentheses

3x-9=0

We move all terms containing x to the left, all other terms to the right

3x=9

x=9/3

x=3

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